tri·​chlor·​fon (ˌ)trī-ˈklȯr-ˌfän How to pronounce trichlorfon (audio)
variants or less commonly trichlorphon
: a crystalline compound C4H8Cl3O4P used especially as an insecticide

Examples of trichlorfon in a Sentence

Recent Examples on the Web Five of these chemicals -- naled, methamidophos, trichlorfon, chlorpyrifos and phorate -- showed up in at least 10% of the cord blood samples. Susan Scutti, CNN, 9 June 2017

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'trichlorfon.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


tri- + chlor- + -fon (irregular from phosphonate, a salt derived from phosphine)

First Known Use

1960, in the meaning defined above

Time Traveler
The first known use of trichlorfon was in 1960

Dictionary Entries Near trichlorfon

Cite this Entry

“Trichlorfon.” Dictionary, Merriam-Webster, Accessed 18 Apr. 2024.

Medical Definition


: an organophosphate C4H8Cl3O4P used as a parasiticide in veterinary medicine
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